HI OP,
Sympathy. I'm pretty sure I have ADD. Never diagnosed as I'm mid-fifties and growing up, I just got shouted at a lot for being scatterbrained and disorganised.
Some things that help me:
For keeping on top of the home:
Flylady - not the whole routine - it's overwhelming. But 5 minute room rescues, 15 minutes to 'company ready' strategies, a morning routine (never mastered the evening one as I get too tired. But if you are a night owl, get a night routine instead.
My routine is:
Feed cat, kettle on, put a washload in, empty dishwasher and reload it with anything still in the sink, clean surfaces, make tea/coffee, while it brews feed birds. While I have tea/coffee I make a short list of things to do today. Not just the 'must' things but also the everyday and the nice stuff. I try to put only one 'difficult' job on each day so it isn't overwhelming.
Food - just keep it simple. If DC are eating from each main food group several times a day, you are doing fine. Mine lived on tinned spaghetti with grated cheese, peas, carrots, apple slices and yoghurts when they were little at least three times a week. They liked it. It was quick and easy.
Get out once a day. I packed a big bag with spare clothes, calpol sachets, nappies, long life snacks, water, wipes, savlon and arnica cream - a real 'any event' bag, and stored it under the buggy. It stayed put unless needed, but meant we could enjoy going out at a moment's notice as I didn't have to plan getting out of the house.
Get several sets of house-keys made and put one in your handbag, one by the front door on a hook, one in your everyday coat etc so you never lock yourself out.
I don't know if these tips help, as I am not sure what issues you have, but I was born disorganised and I know what an uphill struggle it is to try and keep your mind on track over the small things.
from me too.